A212120 - cp's OEIS frontend

A212120 Triangle read by rows T(n,k), n>=1, k>=1, where T(n,k) is the sum of the divisors d of n with min(d, n/d) = k.

n	a(n)
1	1
2	3
3	5
4	7
5	1
6	9
7	1
8	11
9	3
10	13
11	3
12	15
13	5
14	17
15	5
16	1
17	19
18	7
19	1
20	21
21	7
22	1
23	23
24	9
25	3
26	25
27	9
28	3
29	27
30	11
31	3
32	29
33	11
34	5
35	31
36	13
37	5
38	1
39	33
40	13
41	5
42	1
43	35
44	15
45	7
46	1
47	37
48	15
49	7
50	1
51	39
52	17
53	7
54	3
55	41
56	17
57	9
58	3
59	43
60	19
61	9
62	3
63	45
64	19
65	9
66	3
67	47
68	21
69	11
70	5
71	49
72	21
73	11
74	5
75	1

[1, 3, 5, 7, 1, 9, 1, 11, 3, 13, 3, 15, 5, 17, 5, 1, 19, 7, 1, 21, 7, 1, 23, 9, 3, 25, 9, 3, 27, 11, 3, 29, 11, 5, 31, 13, 5, 1, 33, 13, 5, 1, 35, 15, 7, 1, 37, 15, 7, 1, 39, 17, 7, 3, 41, 17, 9, 3, 43, 19, 9, 3, 45, 19, 9, 3, 47, 21, 11, 5, 49, 21, 11, 5, 1]

cp's OEIS Frontend

A212120 Triangle read by rows T(n,k), n>=1, k>=1, where T(n,k) is the sum of the divisors d of n with min(d, n/d) = k.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	7
5	1
6	9
7	1
8	11
9	3
10	13
11	3
12	15
13	5
14	17
15	5
16	1
17	19
18	7
19	1
20	21
21	7
22	1
23	23
24	9
25	3
26	25
27	9
28	3
29	27
30	11
31	3
32	29
33	11
34	5
35	31
36	13
37	5
38	1
39	33
40	13
41	5
42	1
43	35
44	15
45	7
46	1
47	37
48	15
49	7
50	1
51	39
52	17
53	7
54	3
55	41
56	17
57	9
58	3
59	43
60	19
61	9
62	3
63	45
64	19
65	9
66	3
67	47
68	21
69	11
70	5
71	49
72	21
73	11
74	5
75	1

n	a(n)
1	1
2	3
3	5
4	7
5	1
6	9
7	1
8	11
9	3
10	13
11	3
12	15
13	5
14	17
15	5
16	1
17	19
18	7
19	1
20	21
21	7
22	1
23	23
24	9
25	3
26	25
27	9
28	3
29	27
30	11
31	3
32	29
33	11
34	5
35	31
36	13
37	5
38	1
39	33
40	13
41	5
42	1
43	35
44	15
45	7
46	1
47	37
48	15
49	7
50	1
51	39
52	17
53	7
54	3
55	41
56	17
57	9
58	3
59	43
60	19
61	9
62	3
63	45
64	19
65	9
66	3
67	47
68	21
69	11
70	5
71	49
72	21
73	11
74	5
75	1

n	a(n)
1	1
2	3
3	5
4	7
5	1
6	9
7	1
8	11
9	3
10	13
11	3
12	15
13	5
14	17
15	5
16	1
17	19
18	7
19	1
20	21
21	7
22	1
23	23
24	9
25	3
26	25
27	9
28	3
29	27
30	11
31	3
32	29
33	11
34	5
35	31
36	13
37	5
38	1
39	33
40	13
41	5
42	1
43	35
44	15
45	7
46	1
47	37
48	15
49	7
50	1
51	39
52	17
53	7
54	3
55	41
56	17
57	9
58	3
59	43
60	19
61	9
62	3
63	45
64	19
65	9
66	3
67	47
68	21
69	11
70	5
71	49
72	21
73	11
74	5
75	1